Precious tableware includes knife (4)
I believe the answer is:
stab
'knife' is the definition.
('stab' can be a synonym of 'knife')
'precious tableware includes' is the wordplay.
'includes' says the answer is hidden in the clue.
'STAB' can be found hidden inside 'precious tableware'.
(Other definitions for stab that I've seen before include "Plunge knife into" , "Injure with knife" , "Pierce with a knife" , "Impale; attempt" , "Wound with blade" .)